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If cos25^0+sin25^0=p , then cos50^0 is s...

If `cos25^0+sin25^0=p ,` then `cos50^0` is `sqrt(2-p^2)` (b) `-sqrt(2-p^2)` `psqrt(2-p^2)` (d) `-psqrt(2-p^2)`

A

`sqrt(2-p^(2))`

B

`-sqrt(2-p^(2))`

C

`p*sqrt(2-p^(2))`

D

`-p*sqrt(2-p^(2))`

Text Solution

Verified by Experts

The correct Answer is:
C
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MARVEL PUBLICATION-TRIGONOMETRIC FUNCTIONS-MCQs
  1. If costheta=1/2(x+1/x) then 1/2(x^2+1/x^2)=

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  2. If : sin (alpha + beta)=1 and sin (alpha-beta)=(1)/(2), "then" : tan ...

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  3. If cos25^0+sin25^0=p , then cos50^0 is sqrt(2-p^2) (b) -sqrt(2-p^2) ...

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  4. The numerical value of (4)/(3) cot^(2)30^(@)-2csc^(2)60^(@)-(3)/(4) t...

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  5. The numerical value of 3csc^(2)""(pi)/(3) + 4 sin^(2)""(pi)/(4)=A)3 B)...

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  6. (tan60^(@)+sec60^(@)-1)/(tan60^(@)-sec60^(@)+1)A)sec30^(@)+2cos60^(@) ...

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  7. If theta is an acute angle such that 4sin^(2) theta-2(sqrt3+1)sinthet...

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  8. If theta is an acute angle such that 2 sin^(2)theta - 2sqrt2 * sin th...

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  9. If A and B are acute angles such that cot(A+B)=1 and cosec(A-B) =2,"...

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  10. If A and B are acute angles such that 2 cos A*cot B-2cos A-cot B+1=0...

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  11. Find the acute angle A and B such that sec A * tan B -sec A -2 tan B...

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  12. If tan^(2) theta-4sqrt3 * tan theta+3=0,"then" : tan theta=

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  13. prove that: sin^2 3 0^(@)+sin^2 4 5^(@)+sin^2 6 0^(@)=3/2

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  14. prove that: 4 cot^2(45^ @) - sec^2(60^ @)+ sin^2(30^ @) = 1/8

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  15. [(1-tan^(2)30^(@))div(1+tan^(2)30^(@))]-sin30^(@)=A)-1 B)0 C)1 D)2

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  16. 2sin 60^(@)-cos180^(@)+(1//3)sin270^(@)=A)sqrt2+(3)/(2) B)sqrt3+(2)/(3...

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  17. If cos theta=-3//5,"where" piltthetalt(3pi//2), "then" : (cssc theta+...

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  18. If sin theta=3//5,"where" (pi//2)ltthetaltpi, "then" : (sectheta-tant...

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  19. If tan theta=1/sqrt7,then (c o s e c^2theta-sec^2theta)/(c o s e c^2th...

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  20. If sin A=11//61, "where" 0ltAlt(pi//2), "then : (secA+tanA)/(cotA-csc...

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